11559881 has 4 divisors (see below), whose sum is σ = 12239892. Its totient is φ = 10879872.

The previous prime is 11559871. The next prime is 11559887. The reversal of 11559881 is 18895511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8462281 + 3097600 = 2909^2 + 1760^2 .

It is a cyclic number.

It is not a de Polignac number, because 11559881 - 2²² = 7365577 is a prime.

It is a super-2 number, since 2×11559881² = 267261697468322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11559887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339980 + ... + 340013.

It is an arithmetic number, because the mean of its divisors is an integer number (3059973).

Almost surely, 2^11559881 is an apocalyptic number.

It is an amenable number.

11559881 is a deficient number, since it is larger than the sum of its proper divisors (680011).

11559881 is an equidigital number, since it uses as much as digits as its factorization.

11559881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680010.

The product of its digits is 14400, while the sum is 38.

The square root of 11559881 is about 3399.9824999550. The cubic root of 11559881 is about 226.1089679962.

The spelling of 11559881 in words is "eleven million, five hundred fifty-nine thousand, eight hundred eighty-one".